Method and machine for stretching pelt on pelt-boards

Abstract

By a new method for the fastening of pelts stretched on pelt-boards, the belt is secured in a stretched position on the pelt-board by means of a sleeve/bag which is drawn over and around the pelt, so that the pelt is pressed in and locked against the pelt-board by means of the sleeve/bag. The method gives rise to the need for the pelts to be stretched out longer on the pelt-board than has hitherto been possible without damaging the pelts, inasmuch as the pelts will have a tendency to shrink slightly more when they are not fastened to the pelt-board by means of the staples traditionally used. During the stretching of the pelt in a pelt processing machine, by imparting a vibrating movement to the pelt-board and/or the gripping elements while implementing the relative displacement in the longitudinal direction of the pelt-board respectively between the holding elements for the fastening of the pelt, and the first and/or second set of gripping elements for the stretching of the pelt, for example a mink pelt placed loosely beforehand on the pelt-board, it is achieved that the pelt can be stretch out to the desired length without damage to the pelt.

1. Method for the stretching of pelts ( 6 ) on pelt-boards ( 4 ) by a pelt-processing machine ( 2 ) which comprises means ( 10 ,  12 ,  14 ) for the execution of a relative displacement between a pelt-board ( 4 ) on which a pelt ( 6 ) is placed between holding elements, and gripping elements ( 16 ) for the securing of the pelt ( 6 ) during the stretching, characterised in that a vibrating movement is applied to the holding elements for the pelt-board ( 4 ) and/or the means ( 10 ,  12 ,  14 ) for the execution of the relative displacement between the gripping elements ( 16 ) and the pelt-board ( 4 ), and/or the gripping elements ( 16 ), during the execution of the relative displacement respectively between the pelt-board ( 4 ) and the gripping elements ( 16 ) in the longitudinal direction of the pelt-board, for the stretching of the pelt ( 6 ) which beforehand is applied loosely on the pelt-board. 
     
     
       2. Method for the stretching of pelts ( 6 ) on pelt-boards ( 4 ) according to  claim 1 , characterised in that the stretching of the pelt is monitored by a first set of ideal sensors on the pelt-processing machine which correspond to ideal lengths of the pelts, and together with a second set of sensors for increased traction effect, where the sensors are placed in positions with a sensor between two ideal-length sensors in the ideal set, and arranged in such a manner that the stretching of the pelt on the pelt-board is brought to an end if the end of the pelt does not move past an ideal-length sensor within a given time and is at or just past the ideal-length sensor, and furthermore; if the end of the pelt reaches a sensor for increased traction effect between two ideal-length sensors, the stretching of the pelt is continued with increased strength until the next ideal-length sensor is reached, whereupon the stretching is stopped. 
     
     
       3. Method according to  claim 2 , characterised in that the vibrating movement gives rise to a vibrating movement oriented in the longitudinal direction of the pelt-board. 
     
     
       4. Method according to  claim 1 , characterised in that the vibrating movement gives rise to a vibrating movement oriented in the longitudinal direction of the pelt-board. 
     
     
       5. A pelt-processing apparatus comprising at least a first set of holding elements for the fastening of a pelt-board ( 4 ) on which a pelt ( 6 ) is placed, and at least a first set of gripping elements ( 16 ) for fastening in the back side of the pelt, and/or a second set of gripping elements for the fastening of the leg side of the pelt, and means ( 10 ) for the execution of a relative displacement in the longitudinal direction of the pelt-board respectively between the holding elements for fastening of the pelt-board and the first and/or second set of gripping elements ( 16 ), for the stretching of a pelt which beforehand is placed loosely on the pelt-board, characterised in that the holding elements for the pelt-board ( 4 ) and/or the means ( 10 ,  12 ,  14 ) for the execution of said relative displacement between the pelt-board ( 4 ) with the pelt ( 6 ) and/or the gripping elements ( 16 ) for the pelt ( 6 ) on the pelt-board ( 4 ), are provided with a vibrator ( 20 ). 
     
     
       6. Apparatus according to  claim 5 , characterised in that the vibrator ( 20 ) is arranged in such a manner that the vibrating movement gives rise to a vibrating movement oriented mainly in the longitudinal direction of the pelt-board. 
     
     
       7. Apparatus according to  claim 6 , characterised in that it comprises a first set of ideal sensors corresponding to ideal lengths of the pelts, and a second set of sensors for increased traction effect, where the sensors are placed in positions with one sensor between two ideal-length sensors in the ideal-length set, and arranged in such a manner that the stretching of the pelt on the pelt-board is brought to an end if the end of the pelt does not move past an ideal-length sensor within a given time and is at or just past the ideal-length sensor, and furthermore; if the end of the pelt reaches a sensor for increased traction effect between two ideal-length sensors, the stretching of the pelt is continued with increased strength until the next ideal-length sensor is reached, whereupon the stretching is stopped. 
     
     
       8. Apparatus according to  claim 7 , characterised in that the vibrator ( 20 ) consists of a pneumatic vibrator unit. 
     
     
       9. Apparatus according to  claim 7 , characterised in that the vibrator ( 20 ) consists of a vibrator unit ( 20 ) driven by an electric motor. 
     
     
       10. Apparatus according to  claim 7 , characterised in that the vibrator ( 20 ) is driven by a servo-motor. 
     
     
       11. Apparatus according to  claim 7 , characterised in that the vibrator ( 20 ) consists of a hydraulic vibrator. 
     
     
       12. Apparatus according to  claim 6 , characterized in that the vibrator ( 20 ) consists of a pneumatic vibrator unit. 
     
     
       13. Apparatus according to  claim 6 , characterised in that the vibrator ( 20 ) consists of a vibrator unit ( 20 ) driven by an electric motor. 
     
     
       14. Apparatus according to  claim 6 , characterised in that the vibrator ( 20 ) is driven by a servo-motor. 
     
     
       15. Apparatus according to  claim 6 , characterised in that the vibrator ( 20 ) consists of a hydraulic vibrator. 
     
     
       16. Apparatus according to  claim 5 , characterised in that the vibrator ( 20 ) consists of a pneumatic vibrator unit. 
     
     
       17. Apparatus according to  claim 5 , characterised in that the vibrator ( 20 ) consists of a vibrator unit ( 20 ) driven by an electric motor. 
     
     
       18. Apparatus according to  claim 5 , characterised in that the vibrator ( 20 ) is driven by a servo-motor. 
     
     
       19. Apparatus according to  claim 5 , characterised in that the vibrator ( 20 ) consists of a hydraulic vibrator. 
     
     
       20. Apparatus according to  claim 5 , characterised in that it comprises a first set increased traction effect, where the sensors are placed in positions with one sensor between two ideal-length sensors in the ideal-length set, and arranged in such a manner that the stretching of the pelt on the pelt-board is brought to an end if the end of the pelt does nor move past an ideal-length sensor within a given time and is at or just past the ideal-length sensor, and furthermore; if the end of the pelt reaches a sensor for increased traction effect between two ideal-length sensors, the stretching of the pelt is continued with increased strength until the next ideal-length sensor is reached, whereupon the stretching is stopped.